628980340 has 12 divisors (see below), whose sum is σ = 1320858756. Its totient is φ = 251592128.

The previous prime is 628980311. The next prime is 628980349. The reversal of 628980340 is 43089826.

It can be written as a sum of positive squares in 2 ways, for example, as 103103716 + 525876624 = 10154^2 + 22932^2 .

It is a junction number, because it is equal to n+sod(n) for n = 628980293 and 628980302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628980349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15724489 + ... + 15724528.

It is an arithmetic number, because the mean of its divisors is an integer number (110071563).

Almost surely, 2^628980340 is an apocalyptic number.

It is an amenable number.

628980340 is an abundant number, since it is smaller than the sum of its proper divisors (691878416).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

628980340 is a wasteful number, since it uses less digits than its factorization.

628980340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31449026 (or 31449024 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 628980340 is about 25079.4804571387. The cubic root of 628980340 is about 856.7991434328.

The spelling of 628980340 in words is "six hundred twenty-eight million, nine hundred eighty thousand, three hundred forty".